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 Telephone privacy device

Details
Inventors: Eftechiou, Vakis;
Assignee:
Primary Examiner: Schreyer; Stafford
Assistant Examiner:
Attorney, Agent or Firm: Moss, Barrigar & Oyen

A telephone privacy protector for connection to a common exchange line and each one of at least two telephone operated devices sharing a line includes a voice connecting circuit for connection between a respective telephone line operated device and the line. There is a control deice connected to the circuit having an on and off state wherein the control device in the on state permits the voice connecting circuit to operate. There are means for turing the control device on when the respective telephone line operated device goes off hook provided that no other telephone line operated device sharing the line is off hook. There are means for providing a residual charge to the control device in order to reactivate same after the respective telephone line operated device is placed momentarily on hook and then returned to an off hook state while any other telephone line operated device connected to the line is off hook.

DETAILED DESCRIPTION According to one aspect of the invention a telephone privacy protector for connection to a common exchange line and each one of at least two telephone line operated devices sharing the line includes a voice connecting circuit for connection between a respective telephone line operated device and the line.
There is a silicon controlled rectifier connected to the circuit having an on and off state.
There is a means for turning the rectifier on when the respective telephone line operated device goes off hook provided no other telephone line operated device connected to the line is off hook and thereby permitting the voice connecting circuit to operate.
There are means to provide a residual charge to the rectifier in order to reactivate same after the respective telephone line operated device is placed momentarily on hook and then returned to an off hook state while any other telephone line operated device connected to the line is off hook.
According to another aspect of the invention, a telephone privacy protector for connection to a common exchange line and each one of at least two telephone operated devices sharing a line includes a voice connecting circuit for connection between a respective telephone line operated device and the line.
There is a control device connected to the circuit having an o and off state wherein the control device in the on state permits the voice connecting circuit to operate.
There are means for turning the control device on when the respective telephone line operated device goes off hook provided that no other telephone line operated devices sharing the line is off hook.
There are means for providing a residual charge to the control device in order to reactivate same after the respective telephone line operated device is placed momentarily on hook and then returned to an off hook state while any other telephone line operated device connected to the line is off hook.
According to another aspect of the invention, a privacy protecting jack for connection to a common exchange and each one of at least two telephone line operated devices sharing the line includes a jack body having one end adapted for insertion in a connecting jack operatively connected to the exchange line and having a jack receiving socket



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